Flask入门小项目 - 搭建极简博客（3）添加登录、登出功能
目录：
零、效果
在数据库users表中添加几个用户就能登录了
一、app.py
# app.py
from flask import Flask, render_template, flash, request, session, redirect, url_for, abort
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, login_required, login_user, logout_user
app = Flask(__name__)
app.config.from_pyfile('config.py')
db = SQLAlchemy(app)
# flask-login
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = "login"
from models import *
@app.route('/')
def index():
articles = Article.query.all()
articles_dict = [dict(id=article.id, title=article.title, text=article.text) for article in articles]
return render_template('index.html', articles=articles_dict)
@app.route('/login', methods=['GET', 'POST'])
def login():
error = None
if request.method == 'POST':
username = request.form.get('username')
password = request.form.get('password')
info = get_user_info(username, password)
if type(info) != str: # 验证
user = User(id)
login_user(user)
session['login'] = True
flash('You\'ve logged in successfully!')
return redirect(url_for('index'))
else:
error = info
return render_template('login.html', error=error)
@app.route('/logout')
@login_required
def logout():
logout_user()
session.pop('login', None)
flash('You have logged out successfully')
return redirect(url_for('index'))
@app.route('/signup')
def signup():
return 'Hello World!'
@app.route('/post')
def post():
return 'Hello World!'
@app.route('/delete')
def delete():
return 'Hello World!'
@login_manager.user_loader
def load_user(id):
print(id)
return User(id)
def get_user_info(username, password=None):
user = User.query.filter(User.username == username).all()
if len(user) == 0:
return 'username does not exist!'
if user[0].password == password:
return user[0].id
return 'wrong password'
if __name__ == '__main__':
app.run(debug=True)
最上面加了3句话配置login_manager，增加了load_user和get_user_info函数，修改了login和logout函数
二、login.html
login.html
{% extends "base.html" %}
{% block body %}
<h2>Login</h2>
{% if error %}
<p class=error><strong>Error:</strong> {{ error }}
{% endif %}
<form action="{{ url_for('login') }}" method=post>
<dl>
<dt>Username:
<dd><input type=text name=username>
<dt>Password:
<dd><input type=password name=password>
<dd><input type=submit value=Login>
</dl>
</form>
{% endblock %}
